Wireless translating device



May 8, 1928.

W. M. BRUCE, JR

WIRELESS TRANSLATING DEVICE Filed Nov. 8, 1922 2 Sheets-Sheet 1 gluuc ntoz 7M W May 8, 1928. 1,668,998

w. M. BRUCE, JR

WIRELESS TRANSLATING DEVICE Filed Nov. 8. 1922 2 Sheets-Sheet 2 Patented May 8, 1928.

uni-TED STATES;

1,668,998 PATENT o-FFicE.

WILLIAM'M. BRUCE,- JRi, 0E SPRINGFIELD, onto, ,AS'SI'GNORVTO' THE NITED TELE- GRAPH & CABLE COMPANY, OF SPRINGFIELD, OHIO, A CORPORATION-0F OHIO.

WIRELESS TRANSLATING IJEv'IcE.

Application filed November 8; 1922. Serial No. 599,714;

larly relates to the apparatus referred-to in my pending application No. 445,968 filed Feb. 18, 1921. v

In the broader aspects of the lHVOIllLlOIl' it consists in providingfa vibrating receiving device with means for mechanical tuning the same so as to respond to certain definite alternations or oscillations of comparatively. low frequency, thus providing for selectivity in receiving signals particularly of the wireless or so called wired' wireless "char-acteristics.

In the accompanying drawings:

Fig. 1 is a plan'view of a 'deviceembody ing my invention.

Fig. 2 is a side elevation of the same.

Fig. 3 is an endor front elevationof the same. v

Figs. 4,' 5, G, 7, 8 and 9-are details, particularly' of the vib atin'g contact portions of the same. Y I

The main frame of the device consists if preferably of apermanent magnet a of the horse shoetype, the legs ofwhich are provided with pole eXtensions'a 'and a which extend inwardly to the tuned vibrating coil with which these polar extensions cooperate.

The vibrating coil 0 is of the usual type of vibrating coil relays. It is of a very light construction and is supported at top and bottom by the suspensions and c", both of which are preferably provided with adjustable means for varying the tension of the suspensions and thus varying the vibrating period of the coil itself. The upper suspension c consists preferablyof two strands of fibrous material, though metallic suspension may be used. These strands are adapted to be opened and closed by a spreader (Z which is raised and lowered with an adjusting screw (Z to vary the tension on the coil by opening or closing the strands of the double suspension. The strands of the upper suspension C are threaded through a suitable opening in the spreader head (Z and pass on each side of a depending ear or lug (Z so that as the spreader head is lowered or raised more or less tension is placed on the strands of the suspension C. The lower suspension 0 is preferably connected to a pivoted lever c the opposite end of which is connected to a spring 0 having an adjusting screw 0 by which the tension of the spring may be varied. The coil 0 preferably surrounds a core projectingoutwardly from a supporting headb which supports the coil and which is adapted to slide in waysb and '5 on the magnet a. Means are provided for holding the-head Z) in different positions of adjustment in the nature of clamping plates 1) which may be tightened upa ainst the sides of the adjustable head to hold it iii-proper position of adjustment. The coil mechanism is all mounted upon this adjustable head which can be removed or replacediu theffrani'e as desired. lVhcn' used as arelay'tlie"1en'iovable coil is provided with a tongue 6 which is preferably T- shape'd" at the endand on opposite sides of the tongue are placed contacts 6 c with which-the tongue engages as it is vibrated with the-coil These'co'ntacts are'of novel construction andeach consis'ts'of a sleeve 6 mounted on the end of an adjustable screw 0 and in 'tlie end of this" sleeve is fitted'a plate e preferably of silver or some other metal having-affinity forn'ie rcury. On the fzice of this plate there is placed mercury'as indicated at e in-Fig 'T; Thesleeve (Z is made of steer with ivliich; the mercury does not unite and it is possible,therefore, to make amercurial contact by placing the mercury on this plate (Z which assists very materially in making the proper electrical contact. lVhere the two contacts 6 e are employed they are electrically connected together while the tongue itself forms the terminal of the other side of the circuit and as the coil vibrates the circuit is closed by the tongue engaging with the mercury on either or both of the said contacts. The coil 0 is connected in the usual way so as to be in circuit with the incoming signals and by the supporting means which may be adjusted as to respond only to such vibrations as correspond to its natural period of vibration.

I find it advantageous also to use a flexible tongue and to make the length of this tongue so that its natural period of vibrations will coincide substantially to the natural period of the coil so that the tongue itself is mechanically tuned as well as the coil. The flexible tongue t is preferably supported in a sleeve 6 in which it may be secured by any suitable means, preferably by a suitable adhesive material in the nature of sealing wax which can be softened by heat and will harden at ordinary temperatures and adjustment in the length of the tonguecan be secured'by softening the adhesive material and moving it in or out of the sleeve. I have found bythese instruments I can get a range of tuning up to a thousand alternations per second and that the coil and tongue may be made so selective that it will not respond to alternations or vibrations that difter in a small percentage from the one to wh ch itis tuned.

Then this instrument is desired to'be used asa recorder. I substitute for the tongue a siphon which maybe also selected as to its length so as tohave a. natural period of vibration substantially the same as the coil, the ordinary glass siphon being sutiiciently flexible to permit it to vibrate in itsnatural period. I have found with this instrument I can get quite a range of vibration of'the tongue when the movement of the coil itself is hardly perceptible. A continuous series I of rapid alternations through the coil acts as an impact upon the coil. which will vibrate the tongue at the same rate and by reason of its flexibility increase the range at which the coil itself is vibrating.

I The usual arrangements 'are made for establishing electric connections with the tongue and the contactswhen used as a relay and in any case with the terminals of the vibrating coil through which the signals are transmit-ted.

An instrument of this character may be used for wireless reception where signals in radio frequencies are sent out in groups of a certain frequency within the limits of the mechanical tuning of the instrument. It may be also used'in connection with the heterodyne or beat note which may be adjusted to the frequencies to which the instrument is mechanically-tuned.

Having thus described my invention, I claim:

1. In an electric translating device, a movable coil and means for varying the natural period of vibration of said coil, a

flexible tongue on said coil whose length is proportioned to the vibration of the coil so that the period of vibration of the tongue and the period of vibration of the coil are approximately the same.

2. In a translating device such as de scribed, a movable coil having a flexible tongue, means for adjusting the part and tongue to approximately the samenatural period of vibration, and a stationary contact for said tongue.

3. In a translating device having a mov- WILLIAM MJBRUCE. Ja.

this 6th day of November, 1922. c 

